CVE-2026-97944
UnknownSummary
In the Linux kernel, the x86/cfi subsystem has a bug in cfi_get_func_hash() that reads the FineIBT hash from the wrong offset (7 instead of 5). This causes BPF struct_ops trampolines to receive an incorrect hash, leading to a CFI failure on the first indirect call.
Risk Assessment
This can cause immediate kernel panics when using BPF congestion control or other struct_ops, impacting system stability and service availability.
Recommendation
Apply the kernel patch that uses a shared definition of the FineIBT hash offset to ensure correct hash reading.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: x86/cfi: Fix FineIBT hash offset in cfi_get_func_hash() The switch of the FineIBT preamble from "subl $hash, %r10d" to the shorter "subl $hash, %eax" moved the hash immediate from offset 7 to offset 5 of the preamble. fineibt_preamble_hash was updated to match, but the open-coded offset in cfi_get_func_hash() was missed and it still reads the hash at offset 7. cfi_get_func_hash() is used by the BPF JIT to give a struct_ops trampoline the CFI hash of the stub function it stands in for. With FineIBT the trampoline now gets the upper half of the real hash followed by the first two bytes of the next instruction, so the first indirect call from the kernel into a struct_ops program, tcp_init_congestion_control() calling ->init() of a BPF congestion control for example, fails the FineIBT check and the kernel dies with a CFI failure. Move the FineIBT preamble template and its offset defines above cfi_get_func_hash() and use fineibt_preamble_hash there, so every reader of the preamble shares one definition of its layout. The CFI_FINEIBT arm is only built with CONFIG_FINEIBT, the only configuration in which cfi_mode can take that value. cfi_get_func_arity() does not need the same treatment: the __bhi_args call whose displacement it reads still ends at the function address.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS